一、口算。
$64 - 32 =$ $4×8 =$ $15÷3 =$
$5×7 =$ $24 + 42 =$ $27÷4 =$
$73 - 44 =$ $6×6 =$ $28÷5 =$
$3×9 =$ $82 - 45 =$ $27÷6 =$
$36 + 26 =$ $5×5 =$ $14÷7 =$
$6×4 =$ $66 - 38 =$ $30÷8 =$
$23 + 48 =$ $7×3 =$ $55÷9 =$
$9×4 =$ $92 - 73 =$ $42÷8 =$
$81 - 52 =$ $9×5 =$ $35÷7 =$
$2×8 =$ $26 + 47 =$ $48÷6 =$

一、32 32 5
35 66 6……3
29 36 5……3
27 37 4……3
62 25 2
24 28 3……6
71 21 6……1
36 19 5……2
29 45 5
16 73 8

二、估一估，填一填。

二、3 30 4